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Sarcoptic mange in goats and sheep : studies on the defects and economic losses resulting from damage caused by the disease on crust leather / K. E. E. Ibrahim in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 72 (Année 1988)
[article]
Titre : Sarcoptic mange in goats and sheep : studies on the defects and economic losses resulting from damage caused by the disease on crust leather Type de document : texte imprimé Auteurs : K. E. E. Ibrahim, Auteur ; Mukhtar Taha Abu-Samra, Auteur Année de publication : 1988 Article en page(s) : p. 135-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Défauts
Cuirs et peaux de chèvres
ParasitosesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A survey of 5250 goats and 4220 sheep in the Sudan for sarcoptic mange revealed an incidence of 5,5 % (290) in the former and 5,2 % (221) in the latter species, respectively.
Severe and localised or generalised lesions were seen in the infested animals. Skin scrapings from infested animals revealed numerous specimens of sarcoptes scabiei, showing that the animals were heavily infested.
Severe histopathological changes were seen in skin sections. These changes mainly comprised : hyperkeratosis, acanthosis ans scab formation, beneath which numerous mites were seen. Severe cellular infiltration, micro-abscessation, degenerative and necrotic changes and marked proliferation of connective tissue also occured.
Infested skins were green graded as "rejects" and the prepared crust leather was graded as "rejects" or "double rejects". Infested skins were difficult to finish into crust leather. The disease caused a marked reduction in the aesthetic appeal and cutting area of the leather. The crust leather prepared from infected skins was unsightly, hard, and fibrosed, with many tunnellings. The grain surface was coarse, rough and the fibres were loose and had a fluffy appearance. In severely infested areas, numerous holes were seen and, in some cases, the leather was completely damaged.
Leather sections from infested areas showed great distortion and disintegration of the fibres with large areas of micro-abscessation. Towards the grain surface, the fibres along the tunnels of the mite were eaten away, became thin, loose and had a fluffy appearance beneath which many empty spaces and areas of fibrosis were seen.
The disease caused a marked reduction in the tensile strength and apparent density of crust leather. In severely infested animals,the leather specimens were cut before the machine could even give a reading, showing complete loss of durability. The disease caused a false increase in the mean thickness and volume but brought about a marked reduction in the weight of the infested specimens.
Skins so affected were completelyrejected or fetched very low prices resulting in serious economic losses.
Goats were experimentally infested with sarcoptes scabiei mites. The results obtained from the clinical picture of the lesions produced, the grading of skins, the examination of histological and leather sections and physical testing of the crust leather produced, confirmed the results obtained from the survey. Treatment of the experimental lesions led to improvement of the quality of the leather eventually produced, showing that recovery from the damage could be obtained, providing that infested animals are (a) treated in the early stages of the disease and (b) ample time is given before the animals are slaughtered, in order to allow for proper restoration of the skin.En ligne : https://drive.google.com/file/d/1FMSFaYkUa5yy9034OWxCR5Vv3oVyZ3ha/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9104
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 72 (Année 1988) . - p. 135-144[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007134 - Périodique Bibliothèque principale Documentaires Disponible Screening of bacteriocin production from moderately halophilic skin isolates to inhibit moderately halophilic / Pinar Caglayan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 12 (12/2018)
[article]
Titre : Screening of bacteriocin production from moderately halophilic skin isolates to inhibit moderately halophilic Type de document : texte imprimé Auteurs : Pinar Caglayan, Auteur ; Meral Birbir, Auteur Année de publication : 2018 Article en page(s) : p. 385-399 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
BactériocinesLes bactériocines sont une famille de peptides ou protéines synthétisés naturellement par certaines bactéries. Une bactériocine consiste généralement en un composé protéique de 20 à 60 acides aminés.
Les bactériocines ne sont pas des antibiotiques mais elles possèdent des propriétés antibiotiques :
- Elles peuvent être bactériocides, c'est-à -dire éliminer certains micro-organismes.
- Elles peuvent être bactériostatiques, c'est-à -dire inhiber la croissance de certains micro-organismes.
Criblage
Cuirs et peaux -- Analyse
Cuirs et peaux -- Microbiologie
Cuirs et peaux de chèvres
Cuirs et peaux de moutonsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bacteriocins, produced from a wide variety of microorganisms to inhibit or kill different species of bacteria, have received increased attention in different industries. Hence, bacteriocins produced from moderately halophilic skin isolates were examined to demonstrate their inhibitory effect against enzyme-producing (protease or lipase) skin isolates. Eleven identified skin isolates, obtained from salted goat and sheep skins, were used as test isolates. Ten of these isolates (Halomonas halodenitrificans, Halomonas halmophila, Salimicrobium salexigens, Gracilibacillus dipsosauri, Salinivibrio costicola subsp. alkaliphilus, Halomonas venusta, Planococcus rifietoensis, Marinococcus tarijensis, Halomonas eurihalina, Staphylococcus arlettae) showed antimicrobial effect against each other. Although Halomonas halodenitrificans, Salimicrobium salexigens, Halomonas venusta did not produce enzyme, the other isolates produced protease or lipase enzymes. While bacteriocin produced from Halomonas halodenitrificans was found to be effective against enzyme-producing Gracilibacillus dipsosauri, Planococcus rifietoensis and Halomonas eurihalina, bacteriocin of Salimicrobium salexigens was effective against enzyme-producing Salinivibrio costicola subsp. alkaliphilus, Marinococcus tarijensis and Halomonas eurihalina. Bacteriocin of Halomonas venusta was effective against enzyme-producing Halomonas halmophila, Marinococcus tarijensis, Halomonas eurihalina, Idiomarina loihiensis and Staphylococcus arlettae. The maximum bacteriocin production of these skin isolates was obtained at 37°C, pH 7.0, and 10% salt concentration. Antimicrobial activities of the bacteriocins against all test isolates were detected at 10°C-60°C, pH 6.0-8.0 and 3%-20% salt concentrations. Antimicrobial activities of all bacteriocins against test isolates were not detected after the treatment with proteinase K. Minimal inhibitory concentration (MIC) values of the bacteriocins against the test isolates were detected as 1/2, 1/4 or 1/8. Scanning electron micrographs of sheepskins showed that sterile bacteriocins of Halomonas halodenitrificans, Salimicrobium salexigens, Halomonas venusta may be used in leather industry to prevent the growth of protease and lipase producing moderately halophilic bacteria. Note de contenu : - Bacterial strains and growth conditions
- Preparation of cell-free supernatant (bacteriocin)
- Screening of antimicrobial activity of test isolates against each other
- Investigation of optimum conditions for bacteriocin production from halomonas halodenitrificans, halomonas venusta and salimicrobium salexigens
- Effect of heat on bacteriocins produced from halomonas halodenitrificans, halomonas venusta and salimicrobium salexigens
- Effect of salt on bacteriocins produced from halomonas halodenitrificans, halomonas venusta and salimicrobium salexigens
- Effect of enzymes (proteinase K and lipase) on bacteriocins produced from halomonas halodenitrificans, halomonas venusta and salimicrobium salexigens
- Determination of minimum inhibitory concentration s and minimum bactericidal concentration of bacteriocins against enzyme producing moderately halophilic isolates
- Curing and storage of sheepskin samples
- Preparation of sheepskin samples for scanning electron microscopeEn ligne : https://drive.google.com/file/d/1ond8CTRss1UuKa7i6Q_Yb8mCg1DpnmON/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31399
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 12 (12/2018) . - p. 385-399[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20453 - Périodique Bibliothèque principale Documentaires Disponible Self cleaning leathers - The effect of nano TiO2 in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 5 (09-10/2008)
[article]
Titre : Self cleaning leathers - The effect of nano TiO2 Type de document : texte imprimé Année de publication : 2008 Article en page(s) : p. 183-186 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir auto-nettoyant
Cuirs et peaux -- Finition
Cuirs et peaux de chèvres
Dioxyde de titane
Emulsions
Essais (technologie)
Formulation (Génie chimique)
Nanoparticules
PhotocatalyseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study investigated the effects of nano TiO2 in self-cleaning leathers. Nano TiO2 was applied as a top coat to white goat leathers at 25%, 50%, 75% and 100% ratios, based on the amount of lacquer emulsion.
To observe the self cleaning effect, the leather samples to which nano TiO2 had been applied and control samples were stained with mud , coffee and sebum. The stained samples were exposed to UV for 24 hours. It was determined that leather samples treated with nano TiO2 exhibited a photocatalytic effect and a self cleaning effect, which increased depending on the amount of nano TiO2.Note de contenu : - Materials
- Methods : Finishing application - Applications of stains - Self cleaning test
- Fig. 1 : Photocatalyst and chlorophyll
- Fig. 2 : Finishing formulation
- Table 1 : Finishing formulation
- Table 2 : Mud stained leathers - changes in L and b value
- Table 3 : Coffee stained leathers - changes in L and b values
- Table 4 : Sebum stained leathers - changes in L and b valuesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35248
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 5 (09-10/2008) . - p. 183-186[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21781 - Périodique Bibliothèque principale Documentaires Disponible Sodium chloride substitute for lower salt goat skin preservation : a novel approach / Abul Hashem in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 8 (08/2017)
[article]
Titre : Sodium chloride substitute for lower salt goat skin preservation : a novel approach Type de document : texte imprimé Auteurs : Abul Hashem, Auteur ; Navid Arman, Auteur ; Hasibur Rahman Sheikh, Auteur ; Mazharul Islam, Auteur Année de publication : 2017 Article en page(s) : p. 270-276 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorure de sodium -- Suppression ou remplacement
Cuirs et peaux -- Conservation
Cuirs et peaux de chèvres
Industrie -- Pollution -- Lutte contreIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Animal skin is the basic raw materials for the tanning industry, which is the by-product of meat industry. The degradation of skin starts within several hours after the death of animal if it is left untreated. Application of common salt (sodium chloride, NaCl) is the most popular preservation method of skin; it preserves the skin by its dehydrating ability and bacteriostatic effect. The negative effect of sodium chloride is that it generates a huge amount of pollution in the form of total dissolved solids (TDS) during leather processing. In this present study, an investigation was made to preserve goat skin using plant leaf paste. The preservation process was evaluated by monitoring different parameters e.g., shrinkage temperature, hair slip, putrefaction, odor, moisture content, extractable nitrogen, and bacterial count in comparison to the conventional wet salting method. Results indicate that the leaf paste could be used as curing agents to preserve goat skin. Combination of 10% leaf paste + 10% NaCl could preserve the goat skin for a period of 30 days. In this less-salt preservation method, pollution load was reduced e.g., chlorides and TDS in soaking operation by 45.2% and 49.8%, respectively. Note de contenu : - EXPERIMENTAL : Materials - Chemicals - Experimental systems for preservation
- MONITORING THE PRESERVATION METHOD : Determination of moisture content - Determination of extractable nitrogen - Determination of bacterial count - Hydrothermal stability determination - Leather processing - Pollution load generated during leather making - Physical strength of leather - Scanning electron microscope (SEM)
- RESULTS AND DISCUSSION : Optimization of leaf paste
- EFFECTIVENESS OF THE PRESERVATION METHOD : Total extractable nitrogen - Bacterial count - Moisture content - Hydrothermal stability - Pollution load in soaking operation - Physical properties of leather - SEM analysisEn ligne : https://drive.google.com/file/d/1FbbCw1sxUhsB3nTifRH_udat-hBr-RCU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28826
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 8 (08/2017) . - p. 270-276[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19156 - Périodique Bibliothèque principale Documentaires Disponible Studies on alkaline protease from bacillus crolab MTCC 5468 for applications in leather making / Ammasi Ranjithkumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)
[article]
Titre : Studies on alkaline protease from bacillus crolab MTCC 5468 for applications in leather making Type de document : texte imprimé Auteurs : Ammasi Ranjithkumar, Auteur ; Jayanthi Durga, Auteur ; Ramakrishnan Ramesh, Auteur ; Victor John Sundar, Auteur ; Chellan Rose, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2017 Article en page(s) : p. 232-239 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux -- Analyse
Cuirs et peaux de chèvres
Enzymes microbiennes
PeptidasesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bating has become an indispensable operation of leather making to obtain good quality leather. Alkaline proteases are commonly used in leather manufacture in the process of unhairing and bating of hides/skins. In this study, experiments were carried out to test the bating efficacy of a new alkaline protease obtained from Bacillus crolab MTCC 5468 and compared with commercial bate. Impact of alkaline protease on porosity of enzymatically and conventionally unhaired goat skins, have been compared. New enzyme treated pelt was free from scud and pigments, with fine, clean, white, silkier grain and pliable. The result was superior to that of commercial bate treated pelts. The pore size/distribution and water vapor permeability was better than commercial bate and conventionally unhaired skins. Scanning electron microscopy and histological analysis of pelt obtained from new alkaline protease based process reveals complete removal of scud and better opening up of collagen fibers. Moreover, the collagen was not damaged and resulted in good quality of leather. The physio- chemical studies conclusively show that among the experiments, the skins unhaired with new alkaline protease was better in comfort properties than the conventionally unhaired skins as inferred by porosity measurements. Using new alkaline protease for bating led to better results than commercial bate. The study indicates improved efficiency of bacterial alkaline protease in leather processing for beam house applications. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Qualitative analysis for efficiency of bating - Analysis of unhairing and bating spent liquor - Chrome liquor analysis - Water vapor permeability measurement - Capillary flow porometry analysis - Histological analysis - Scanning electron microscopic analysis - Shrinkage temperature of the wet blue leathers - Physical and organoleptic properties of leather
- RESULTS AND DISCUSSION : Qualitative analysis of bating - Protein content in unhairing and bating spent liquors - Water vapor permeability - Capillary flow porometry analysis - Scanning electron micrograph analysis - Histological analysis - Physical and organoleptic properties of leather - chrome contentEn ligne : https://drive.google.com/file/d/1Quyk6d9iv6UdGf9haqVeQgtytIIUdeo1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28821
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Code-barres Cote Support Localisation Section Disponibilité 19155 - Périodique Bibliothèque principale Documentaires Disponible Studies on the henna-glutaraldehyde combination tanning system / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 3 (03/2011)
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PermalinkPermalinkLa tannerie - Tome II / Louis Meunier / Paris : Gauthier-Villars Editeur (1952)
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PermalinkThe modification and colouration of leather by graft polymerisation / W. R. Dyson in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 57 (Année 1973)
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